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Romy the Cat's
personal site dedicated to advanced audio and evolved music reproduction
techniques
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[quote user="deemon"]Do you mean a battery bias , Brian ? We didn't try it because of 1 V bias voltage - I don't know if the battery with this voltage does exist . I know only 1,5 V and 1,2 V cells ...... maybe using some chemical reactions we can ob...
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In the absent of any counter hypothesis I stick to mine. By introducing a relatively high level of harmonic distortion at the beginning of the amplification chain with "natural" decay structure the result that reaches our ear/brains is most pleasing,...
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Excellent! I don't use step-ups and I always tie signal earth to chassis earth through a 10 ohm resistor at input.Brian....
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Dima, did you & Romy experiment with contact-potential biasing of the second stage before settling on fixed-biasing? My Spice files are on my old computer and effectively lost else I would run simulations out of curiosity.Brian....
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[quote user="deemon"]Brian , I never tried SSG cap in phonostage . SSG has a good reputation ..... but I'd prefer teflon for coupling . Mica caps , even good ones like SSG , seems too "bright" for me , but teflon sound pretty neut...
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[quote user="deemon"]Brian , I never tried SSG cap in phonostage . SSG has a good reputation ..... but I'd prefer teflon for coupling . Mica caps , even good ones like SSG , seems too "bright" for me , but teflon sound pretty neut...
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[quote user="Romy the Cat"]Brian, and how do you find your MOSFET behaves compare the 12AX7-based cathode follower?[/quote]Romy, I have yet to try. Only got them on recommendation very recently. They're cheap enough to try in a B9A plug-in without al...
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I have some ZVN0545A mosfets here for exactly that purpose of replacing cathode followers. You may like to try this starting at 2mA (250V supply, 125k biasing resistor). Did you or Dima try Soviet SSG silver-mica for the first coupler? I am using 0.1...
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My stereo corrector (834P with air-vane caps) has a shorting switch across the two channels at the input. I suggest you incorporate the same.With it out of circuit I did indeed get that hum you refer to with the SPU Mono. Switching to short eliminate...
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Per Winfeld confirmed to me that the coil former assembly is rotated 45% compared to the regular SPU such that only lateral motion is sensed. Unfortunately I did not think to ask him how the coil/coils was/were wound. Since the quoted DCR is signific...
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That sounds a decent price, less than my (Japan-sourced) SPU Mono.However, SPU's the gal for me and I reckon we're married for life.I listen at civilised levels too John - tho' neighbours have just left for 3 months in Kenya........Brian....
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You were given damn good advice Bud. So much has disappeared into the Black since WW2...
Through symmetry I would guess your technique would be appropriate to microphone diaphragms too.
I have taken the liberty to send a copy of your paper to...
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Bud, has the military been involved? Seems highly relevant for Sigint and hydrophone applications.
Brian....
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Cost isn't extortionate for such an interesting experiment.
I don't think Denon experimented with gem-stone cantilevers, that's very much a Dyna thing, though I believe they used boron for the 103M - which Romy has.
Brian....
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Flushed you!
We look forward to your future assesment MJ.
Certainly the speed of propagation through the stylus bar will be increased.
Hopefully riveted cymbals shall corruscate as shimmering sunlight on the surface of a deep, dark pool ruffl...
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[quote user="Ed"]Someone I know has just sent his 103R off to get a ruby cantilever fitted.[/quote]
Why, wasn't stock *H*I*F*I* enough for him?
Brian...
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[quote user="skushino"]Thank you Brian - you confirmed what I feared.Caveat emptor. The seller is the former Van denHul repair guy in Germany - Detlev Brod. He offered a new SPU mono, at a price too good to be true. I specified the GM25, and when I c...
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R1 (green/brown/orange or yellow/violet/orange) needs to be paralleled with a 12k resistor to bring the loading seen by the cart to just under 100 ohms.
Brian....
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[quote user="starboy"]A friend has a fixed headshell model S2 and is about to trade for a detachable;just for convenience but worries if there is any extra sonic merit in the model he alread has? Any idea Mr B____ [/quote]
Obviously the fixed head...
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A Series 2 should be dandy Alex
Brian....
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Hello Scott, since the microgroove specification states groove width as 2.6 mil and 65 um is also 2.6 mil you will see that the stylus will only ride the top of the groove and not enter it.
So it's not so much danger of damaging your LPs but of simp...
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"Bugger dogma!". Romy is quite right challenging my obeisance to the Series 1. These things are so rare and when found are likely to be in a somewhat less than pristine condition.
However, it is not only the arm tube that is more massive but the ...
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Alex, the best version would be the first (Series 1) version but these are very rare. Next best would be the pre-Improved Series 2, having metal knife-edge bearings. The Improved would be OK for light-weight, light-tracking MM carts, having been deve...
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Oh Romy, didn't you notice my "mischievous wink"? ;o)
Sorry if the humour was poorly expressed.
The subject title was reference ONLY the to musical content, which was no disappointment but positively delightful.
Brian....
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I've played mine and there are certainly enticing & entrancing performances. Apart from the untidy transitions things don't sound toooo bad on the whole.....considering ;o)
BTW I've posted Thorsten's copy on.
Thanks Romy
Brian....
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[quote user="Romy the Cat"]This is funny that you, the British guy, buy a European made cartridge in Japan… [/quote] Yes, I'm laughing - I've saved 40% on the Euro price! ;o) Brian. ...
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[quote user="Romy the Cat"] When you used your 25Dia then can you recall a similar experience at the beginning of the cartridge live (sharpness and bass)? [/quote]
I have yet to own a CG25 Romy, my very first Ortofon - SPU Mono - is on its way fro...
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What you have there Romy is essentially the cartridge Ortofon introduced in 1948, the first production moving coil cartridge.
The motor is the same, just the "suspension" material changed from india rubber to a modern elastomer AFAIK. Also the G-sty...
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I have never contacted Mr Andreoli but his fax number was passed onto me for a friend by Christian Rintelen of HiFi Scene magazine in Switzerland. Maybe the fax number is also Andreoli's 'phone number? Christian said that he is not online.
25micro...
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Romy, it has just struck me that you could try and find someone who could replace with a smaller diameter diamond, a 17 mil or even a 12 mil! Then you could experiment with which type best suits your favourite mono pressings. This is what professiona...
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